74
10.4.2 Trip calibration
Switches and multiturn potentiometers for setting the trip points are located on top of the unit
(see figure 10.7). For each of channels A and B:
i Set trip switch to H (high) or L (low) as required (see table 10.4
for relay operation).
ii Set input current to the required value for trip-point.
iii Adjust SET A/SET B until LED A/B is on: then slowly adjust until
LED goes out.
iv Relays are energised in normal operation and de-energised when
tripped. A lit LED shows the safe condition (not tripped).
Table 10.4
Trip
switch
A or B
Operation PWR
LED
A or
B
LED
Relay contacts
11 - 12
8 - 9
10 - 11
7 - 8
H (high) Input > trip setting • open closed
H (high) Input < trip setting closed open
L (low) Input > trip setting closed open
L (low) Input < trip setting • open closed
- - • • open closed
Terminal Function
1 Current input
2 Transmitter supply +ve
3 Common
7 Trip B (NC)
8 Trip B (COM)
9 Trip B (NO)
10 Trip A (NC)
11 Trip A (COM
12 Trip A (NO)
13 Supply –ve
14 Supply +ve
Figure 10.7:
Top label
for MTL5314
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